Webster's English Dictionary

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contractor

con.trac.tor \'ka:n-.trak-t*r, k*n-'\ n 1: one that contracts or is party 
   to a contract : as  1a: one that contracts to perform work or provide 
   supplies on a large scale  1b: one that contracts to erect buildings  2: 
   something (as a muscle) that contracts or shortens